Update Block Attributes

[Ajit Joshi]

Hello

I want to update a block attribute after inserting the block. The block is getting inserted. When I try to obtain Attribute collection I see nothing. I have Pasted the code below. Please advice the solution

[CommandMethod("BlockAtt")]
        public void BlockAtt()
        {
            //AcadApplication acAPP = new AcadApplication();

            ObjectId msId;

            string BlockPATH = @"C:\AutoGen\Library\LWP\Rail Reaction\React_CarRail C - CwtR.dwg";

             //= new AcadApplication();
            Document acD = Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acD.Database;

            //string BlockPATH = @"C:\AutoGen\Library\LWP\Jamb\BS\CO - E-102 - BS - Plan.dwg";
            Point3d insPT = new Point3d(0, 0, 0);
            int sFac = 2;
            

            using (DocumentLock acLocDoc = acD.LockDocument())
            {
                using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
                {

                    ObjectId ObjID;

                    // Open the Block table for read
                    BlockTable acBlkTbl = acCurDb.BlockTableId.GetObject(OpenMode.ForRead) as BlockTable;

                    // Open Modelspace to add block
                    BlockTableRecord ms = acBlkTbl[BlockTableRecord.ModelSpace].GetObject(OpenMode.ForWrite) as BlockTableRecord;

                    using (Database dbInsert = new Database(false, true))
                    {
                        dbInsert.ReadDwgFile(BlockPATH, FileShare.Read, true, "");
                        ObjID = acCurDb.Insert(Path.GetFileNameWithoutExtension(BlockPATH), dbInsert, true);
                    }

                    BlockReference BlkRef = new BlockReference(insPT, ObjID);
                    ms.AppendEntity(BlkRef);
                    acTrans.AddNewlyCreatedDBObject(BlkRef, true);

                    Scale3d BlkScale = new Scale3d(sFac, sFac, sFac);
                    BlkRef.ScaleFactors = BlkScale;

                    BlkRef.Rotation = (0 * Math.PI / 180);

                    AcadApplication AcadAPP = (AcadApplication)Application.AcadApplication;
                    AcadAPP.ZoomExtents();

                    
                    msId = acBlkTbl[BlockTableRecord.ModelSpace];
                    //UpdateAttributesInBlock(msId, blockName, attName, AttValue, BlkRef);

                    acTrans.Commit();
                }
                UpdateAttributesInBlock(msId, blockName, attName, AttValue);
            }


        }

        public static void UpdateAttributesInBlock(ObjectId btrId, string BlkNm, string attNm, string AttVal)
        {

            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;

            Transaction tr = db.TransactionManager.StartTransaction();
            using (tr)
            {
                //BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

                BlockTableRecord btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead);
                // Not needed, but quicker than aborting

                foreach (ObjectId entID in btr)
                {
                    Entity ent = tr.GetObject(entID, OpenMode.ForRead) as Entity;
                    if (ent != null)
                    {

                        BlockReference br = ent as BlockReference;
                        if (br != null)
                        {
                            BlockTableRecord bd = (BlockTableRecord)tr.GetObject(br.BlockTableRecord, OpenMode.ForRead);
                            if (bd.Name == BlkNm)
                            {
                                AttributeCollection attCol = br.AttributeCollection;
                                
                                foreach (ObjectId arId in attCol)
                                {
                                    DBObject obj = tr.GetObject(arId, OpenMode.ForRead);
                                    AttributeReference ar = obj as AttributeReference;
                                    if (ar != null)
                                    {
                                        if (ar.Tag == attNm)
                                        {
                                            ar.UpgradeOpen();
                                            ar.TextString = AttVal;
                                            ar.DowngradeOpen();
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                tr.Commit();
            }
        }